EP2630012A2 - Fehlersichere parkbremse für kraftfahrzeuge - Google Patents
Fehlersichere parkbremse für kraftfahrzeugeInfo
- Publication number
- EP2630012A2 EP2630012A2 EP11771120.0A EP11771120A EP2630012A2 EP 2630012 A2 EP2630012 A2 EP 2630012A2 EP 11771120 A EP11771120 A EP 11771120A EP 2630012 A2 EP2630012 A2 EP 2630012A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- electronic control
- control unit
- parking brake
- electric
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 101100400378 Mus musculus Marveld2 gene Proteins 0.000 claims 1
- 230000006870 function Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
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- 238000004891 communication Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/08—Brake-action initiating means for personal initiation hand actuated
- B60T7/10—Disposition of hand control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/58—Combined or convertible systems
- B60T13/588—Combined or convertible systems both fluid and mechanical assistance or drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/748—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on electro-magnetic brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/045—Brake-action initiating means for personal initiation foot actuated with locking and release means, e.g. providing parking brake application
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/08—Brake-action initiating means for personal initiation hand actuated
- B60T7/10—Disposition of hand control
- B60T7/107—Disposition of hand control with electrical power assistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/1755—Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/413—Plausibility monitoring, cross check, redundancy
Definitions
- the invention relates to an electronic control device according to the preamble of claim 1 and a brake system according to the preamble of claim 16.
- an electromechanical Fest ⁇ parking brake system for motor vehicles which comprises a brake ⁇ actuator, an electronic control device for converting input signals into corresponding output signals and two motor-actuated parking brakes, which can be controlled in response to output signals of the STEU ⁇ er planted are.
- the electronic control device has two or more parallel control units for the separate processing of the input signals.
- at least one parking brake can be actuated in the event of an error in one of the branches.
- a backup battery for supplying the control units and the motors can be connected via an additional switch.
- vehicles with automatic transmission it is provided to use the parking brake in Ge ⁇ gearbox to hold the vehicle in the event of an electrical failure instead of a reserve battery.
- typical vehicles with manual transmission can ensure a sufficient Ab monkeit on the slope by inserting a suitable gear stage by serving as a second redundant means for preventing the vehicle from rolling away next to the parking brake.
- a parking brake system for motor vehicles with a control element and at least two electromechanical actuators for generating a parking brake force on each wheel of the motor vehicle is known in which the electromechanical actuators are each provided with a wheel electronics and wherein the operating element by means of a first signal line is connected via a control unit with the wheel electronics of the first electromechanical actuator and is connected by means of a second Signallei ⁇ tion via a further control unit with the wheel electronics of the second electromechanical actuator. Furthermore, at least one third signal line is vorgese ⁇ hen, the control directly to the wheel electronics or each with one of the electromechanical actuators connects and transmits the driver's request.
- the third signal line is designed such that it on the one hand ⁇ connects the control directly to the wheel electronics of the electromechanical actuators and on the other hand connects the two wheel electronics together and allows communication between the wheel electronics.
- a redundant power supply of the parking brake system ⁇ is provided.
- the parking brake system is complex and thus costly.
- Object of the present invention is to provide an alternative electric parking brake, which allows a fail-safe holding the vehicle on a slope.
- an electronic control unit for a brake ⁇ system of a motor vehicle which ⁇ least having Minim an interface to an operating element, in particular a parking brake operating switch, and at least two drive circuits for electric actuators, insbesonde ⁇ re electric parking brake actuators.
- the electronic control unit has two or more independent Re ⁇ chenajien, which are directly connected to each other via a data bus.
- Usual controls for the parking brake have redundant, ie multiple existing, switching contacts and a redundant connection to the control unit.
- each arithmetic unit can normally control the actuators assigned to it or one arithmetic unit all the actuators of the parking brake.
- the further arithmetic unit for optimal use of the existing computing power to run other programs and only take over the parking brake control when an error message arrives on the data bus or fails to re ⁇ gellace incoming message about the correct function of the other arithmetic unit.
- the integration of on ⁇ control circuits including power electronics in a control unit ensures a low production cost. Since equipped with the inventive electronic control unit braking system provides a secure holding slightest ⁇ tet, can be dispensed with automatic transmission, the Ge ⁇ gear lock in motor vehicles.
- each associated with a power supply at least two independent rake ⁇ units, which preferably comprises at least a voltage converter and Minim ⁇ least includes a backup, in particular in each case a bat ⁇ terie and / or a generator.
- a backup in particular in each case a bat ⁇ terie and / or a generator.
- the independent processing units and the data bus are integrated on a substrate, in particular a Si ⁇ lizium chip.
- This allows a cost- effective production and - favored by the small Di ⁇ mensionsen - a fast data transfer on the data bus with short latencies.
- information about the state of the vehicle which is typically present in the control unit of the brake system, to be exchanged between the arithmetic units.
- the further arithmetic unit can therefore execute programs that provide comfort-oriented driver assistance functions using appropriate information, for example. Since the data transmission takes place via the data bus between the arithmetic units, the program structure is simplified compared to the execution of all programs on one arithmetic unit.
- Particularly advantageous ⁇ way it, even if other parts of the controller are integrated on a substrate or silicon-chip, in particular the comprehensive also the computation units silicon chip. This further reduces manufacturing costs and allows a more compact design of the controller.
- At least two of the independent computing units are at least partially redundant.
- the function ⁇ groups with the highest error probability redundant, that are repeatedly executed, can also occur in a single error, the normal programs of Recheneinhei th ⁇ continue to be executed.
- At least one of the arithmetic units is designed as a core redundant microcontroller, in particular with two processor cores operating in the lockstep method.
- Two lockstep processor cores are characterized by a compare unit connected to both processor cores that allows single-fault detection. If three redundant cores and a circuit for determining a majority decision are used, a single error can not only be detected but also corrected.
- At least one of the processing units is configured as a microcontroller with asynchronous redundancy, two cores at least partially access shared A ⁇ directions, in particular a secured with parity check volatile or non-volatile memory.
- the components can be executed redundantly or repeatedly, which have the highest error probability. An increase in reliability with asyn ⁇ redundant redundancy is therefore associated with less effort than kernredundanten microcontrollers.
- At least one of the computing units is designed as a microcontroller protected by a watchdog counter, which has two mutually monitoring programs. performs.
- This variant offers, among other things by the recognition of endless loops an increased reliability compared to a simple microcontroller at low cost.
- At least two independent drive ⁇ circuits for electric parking brake actuators in particular pulse width modulation circuits and bridge circuits, present, each associated with a power supply, which preferably comprises at least one voltage converter and at least one fuse, in particular in each case a battery and / or a generator.
- a power supply which preferably comprises at least one voltage converter and at least one fuse, in particular in each case a battery and / or a generator.
- Independent powering of the independent drive circuits further increases reliability.
- At least one of the processing units for error detection means comprises, which outputs a signal on the data bus and / or a Def ⁇ ler bainier when an error occurs.
- This can be provided in particular by a special circuit arrangement which, in the event of an error of the monitored arithmetic unit, ensures that corresponding error or switching signals arrive at the other arithmetic unit and / or special changeover switches.
- a first arithmetic unit with two drive circuits for electric Parkbremsaktua- factors, in particular bridge circuits, connected wherein in the connection between the first arithmetic unit and at least one drive circuit, a changeover switch is attached, which with a second arithmetic unit and a fault interface ⁇ the first computing unit is connected.
- the first arithmetic unit controls both parking brake actuators, whereby the full computing power of the second arithmetic unit is available for executing other programs.
- the second arithmetic unit could also be switched to a power-saving mode with a reduced clock frequency and / or a limitation of the functional blocks supplied with power.
- each raking ⁇ unit controls its associated Parkbremsaktuator. If an error occurs in one of the arithmetic units, then at least the parking brake actuator can be connected, which is assigned to the other arithmetic unit.
- a first changeover switch is mounted, and in the connection between the second arithmetic unit and the second drive circuit, a second changeover switch is mounted, wherein the first Um- Switch is connected to the second arithmetic unit and an error interface of the first arithmetic unit, and the second switch is connected to the first arithmetic unit and an error interface of the second arithmetic unit.
- each arithmetic unit comprises means for error detection which can control a changeover switch located between the arithmetic unit and the associated parking brake actuator via an error interface with switching signals, the actuation of both parking brake actuators is ensured even in the event of an error in one of the arithmetic units.
- the electronic control unit Minim ⁇ least includes an acceleration sensor, at least one
- Yaw rate sensor and at least one interface for Rad ⁇ speed sensors. This information enables a vehicle dynamics control of the motor vehicle and a slip control of the brake system.
- the electronic control unit comprises at least one interface to a Extern Scheme, in particular egg ⁇ nem CAN or FlexRay bus.
- a Extern Scheme in particular egg ⁇ nem CAN or FlexRay bus.
- an engine torque request can be sent to the engine control unit for traction control.
- the electronic control apparatus comprises min ⁇ least an electrically controlled hydraulic valve, min ⁇ least an electric hydraulic pump, and at least an interface for pressure sensors. These components enable electronic control of a hydraulic brake system ⁇ .
- the invention further relates to a brake system for a motor vehicle comprising a service brake on all wheels and electric parking brake actuators on at least two Ra ⁇ countries, comprising an inventive electronic Steuerge ⁇ advises that is connected to the electric parking brake actuators.
- the brake system of the invention the service brake at least one hydraulic brake circuit and the electronic Steuerge ⁇ advises provides a slip control and / or driving dynamics control ready.
- the wheels of at least one axle as a brake operation ⁇ electromechanical friction brakes on.
- the invention further relates to a motor vehicle which is equipped with a brake system according to the invention.
- an internal combustion engine and / or an electric motor of the motor vehicle according to the invention via an automatic transmission without gear lock with the wheels of at least one axis is connected.
- Show it 1 is a schematic representation of a brake system
- FIG. 3 shows a second embodiment of a failsafe ⁇ ren parking brake
- Fig. 4 shows a third embodiment of a fail-safe ⁇ ren parking brake
- FIG. 5 shows various embodiments of at least partially redundant arithmetic units.
- FIG. 1 shows schematically an example of a brake system 1, which is equipped with a service brake on all wheels and ei ⁇ ner parking brake on two wheels.
- the wheels of the rear axle are equipped with hydraulic friction brakes 2a, 2b and electric parking brake actuators 3a, 3b, while the wheels of the front axle only hydraulic Reibbrem ⁇ sen 2c, 2d have.
- Both the operating and the parking brake are ver ⁇ connected with an electronic control unit 6, which has two independent computing units, 7, 7 ⁇ and receives a parking brake operating switch 5 a driver request for actuating the electric parking brake.
- the service brake may have hydraulic friction brakes or fully or partially electromechanical brakes.
- the control unit 6 according to the invention enables a fail-safe Parking brake both with a purely hydraulic service brake as well as with a combination brake, which has, for example hyd ⁇ raulische brakes on the front axle and electromechanical friction brakes on the rear axle. If at least the wheels of an axle are equipped with hydraulic friction brakes, the electronic control unit 6 is preferably equipped with solenoid valves and an electrically controllable hydraulic pump.
- the electronic control unit 6 is preferably equipped with RadFEmentsenso ⁇ ren on all controlled wheels and / or at least one yaw rate sensor and a lateral acceleration sensor (the sensors are not shown in Fig. 1).
- the slip and / or vehicle dynamics control can be effected by means of methods known per se, as published, for example, in EP 0 792 229 B1.
- the braking system 1 suitably has a (not ge Service ⁇ TES) brake pedal may actuate via which the driver's operation ⁇ brake.
- the brake pedal can act with or without auxiliary power assistance, for example by a vacuum brake booster on a master cylinder, which causes a pressure increase in at least one hydraulic brake circuit.
- the brake pedal ⁇ may be equipped with a displacement or angle sensor.
- the braking torque requested by the driver can then take a regenerative braking during wel ⁇ cher all or part ⁇ example by an electric motor in the generator mode is established. This allows recuperation, in which the kinetic energy of the vehicle is converted into electrical energy and eg stored in a battery.
- the use of a power-operated service brake and a Simula ⁇ sector to provide a comfortable pedal feel is possible.
- the electronic control unit 6 has at least two computing units 7, 7 ⁇ operating essentially independently of each other, in which a reliable functioning of the overall system is ensured by suitably adapting the arithmetic unit, further circuit parts and control programs.
- Figure 2 shows a first embodiment of a remplissi ⁇ Cheren parking brake.
- Figure 2 shows a first embodiment of a remplissi ⁇ Cheren parking brake.
- operating switches 5 and redundant switching contacts against a ⁇ over single errors safe line (such as two insulated wires and ground) connected to the electronic control device 6.
- the control unit 6 has in this example two guide From ⁇ kernredundante microcontroller 7, 7 ⁇ , the two cores ⁇ 1.1, 1.2 and ⁇ ⁇ 2.1, ⁇ have 2.2, which are operated in lockstep method. That is, the two processor cores each execute the same instructions, whereupon the results are checked for consistency in a comparator. If deviations occur, then this can be done in an error handling routine the cause is determined and / or the processor cores are synchronized he ⁇ neut.
- the kernredundanten microcontroller 7.7 ⁇ are directly connected to each other via a data bus 13 to which preferably no further function blocks or external circuits are connected. This allows fast data transmission ⁇ (ie, high transmission rate) without long latency times (since both short signal propagation times and high potential clock speeds are reached).
- Each of the kernredundanten microcontroller 7.7 ⁇ is a drive circuit 8, 8 ⁇ associated with an electric parking brake actuator 3a, 3b, in particular a bridge circuit.
- the two arithmetic units 7,7 ⁇ independently of each other or the electric motor Parkbremsaktuatoren 3a, 3b each control a wheel.
- the two core redundant microcontroller 7.7 ⁇ an at least partially independent power supply 9.9 ⁇ .
- These may be independent DC converter ⁇ each with its own fuse, which are connected to a battery and / or a generator. Increased reliability can be achieved with two independent batteries.
- the drive battery can be equipped with a suitable voltage converter, which is designed (corresponding to the much higher voltage) suitable.
- the drive ⁇ circuits 8, 8 ⁇ are connected to separate power supplies.
- the electronic control unit 6 preferably has one or more interfaces or interface modules 10 for
- External data buses such as CAN or FlexRay.
- Requests are sent to an engine control unit, e.g. makes sense for a traction control.
- a logical decision to actuate or release the parking brake can be triggered by a parking brake switch operation or the present operating state of the vehicle, such as switching off the ignition (whereupon the parking brake is applied) or starting (which causes a release of the parking brake, preferably depending ⁇ speed of the accelerator pedal actuation or the currently applied engine torque is carried out). Then the electrical or electromechanical Parkbremsaktuatoren be energized parallel or offset in time. Since the parking brake actuators have a me ⁇ chanical locking function, the braking effect is maintained even without power supply after the operation.
- a parking brake constructed according to the invention achieves a fault tolerance along the operating path between operating element 5, such as parking brake button or switch, control unit 6 and actuator 3a, 3b.
- the electromechanical parking brake actuators 3a, 3b can to a specific friction brake such as a duo-servo drum brake which is assigned in addition to egg ⁇ ner used for the service brake disc brakes the corresponding wheel, or via a suitable integrated in the brake caliper tightening member such as the Brake discs of the service brake act (one also speaks of integrated parking brake).
- such a system structure allows the gear lock to be omitted in automatic transmissions or to represent a safe parking possibility in electric vehicles without manual transmission and with insufficient self-locking even when a single fault occurs.
- the control unit used for the control or the corresponding circuit part and the corresponding wiring can likewise be dispensed with.
- FIG. 1 A second embodiment of a fail-safe parking brake is shown in FIG. This differs therefrom ⁇ by of the embodiment shown in Figure 2, the one switch 11, the first arithmetic unit 7 with the second electric parking brake actuator 8 ⁇ connects.
- the first computing unit 7 controls both Parkbremsaktuatoren 8, 8 ⁇ directly.
- the second processor 7 ⁇ can be ⁇ provides ge, for example, raised stabili the comfort of the driver running an independent program, so that the existing computing power is optimally used and extra features hen ⁇ .
- the second arithmetic unit also
- the second arithmetic unit 7 accepts at least one electrical Parkbremsaktuators ⁇ driving.
- the first arithmetic unit 7 has means for error detection which, in the event of a fault, send a signal 12 to the switch or multiplexer 11, which connects the drive circuit of at least one actuator to the second arithmetic unit 7 ⁇ .
- switch 11 may also include circuitry for detecting rising and falling edges of signal 12, respectively.
- the parking brake actuators can separate voltage sources of the two independent processing units 7, 7 carried ⁇ (in particular kernredundanten microcontrollers) and zugordnete power electronics (or drive circuits) or also be carried out via a changeover switch or multiplexer switchable.
- FIG 4 shows a third embodiment of a fail-safe parking brake ⁇ .
- Switch 11 is now configured such that each ⁇ wells a computing unit that can take over the other wheel associated calculation unit, the driving of the Parkbremsaktua- tors.
- One can switch 11 in principle also be considered as two separate switches, each by an error signal 12, 12 ⁇ of the normally to the driving circuit 8, 8 ⁇ connected computing unit 7, 7 ⁇ are driven.
- both parking brake actuators 3a, 3b can be controlled by the error-free computing unit (either 7 or 7 ⁇ ).
- FIG. 5 shows various embodiments of at least partially redundant arithmetic units.
- 510 shows two synchronous or operating in lock-step process processor cores 511, 512.
- processor cores lead both processor cores ⁇ identical instructions, and the results are checked in a comparator connected to two processor cores on a match. If an error occurs can be determined by a special error handling program, the Ur ⁇ thing and / or the faulty processor core are brought into a defined state. In particular, it is possible to operate the two processor cores again in the lockstep method after successful conclusion of a test routine.
- a further increase in reliability is mög ⁇ exist if three identical processor cores execute the instructions. Thus, (assuming a single ⁇ error) even if an error occurs, the "utility program" are carried out without interruption.
- the processor cores are suitably ⁇ advantageously integrated on a substrate or chip, prin ⁇ zipiell also an implementation with separate microcontrollers would owners, controllers possible Depending on the likelihood of error, the processor cores may also share some facilities, such as a nonvolatile memory, with the program data, as long as they have suitable error detection means, such as a parity check.
- 520 shows a microcontroller with two asynchronous processor cores 521, 522 monitoring each other or an architecture in which one processor core monitors the other as it drives the external actuators.
- identical or different types of processor cores can be used.
- the microcontroller may also have only partially duplicated structures such as processor core and / or memory. Other parts such as non-volatile memory and / or peripheral elements are protected by other security techniques such as parity monitoring or internal plausibility.
- FIG. 530 shows an embodiment in which preferably emulate tasks running independent software ⁇ independent software ⁇ units.
- the various software routines monitor each other; By a watchdog counter, which must be reset in normal operation at regular intervals, the microcontroller is externally protected.
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- Engineering & Computer Science (AREA)
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- Valves And Accessory Devices For Braking Systems (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102010042595 | 2010-10-18 | ||
DE102011084534A DE102011084534A1 (de) | 2010-10-18 | 2011-10-14 | Fehlersichere Parkbremse für Kraftfahrzeuge |
PCT/EP2011/068065 WO2012052380A2 (de) | 2010-10-18 | 2011-10-17 | Fehlersichere parkbremse für kraftfahrzeuge |
Publications (2)
Publication Number | Publication Date |
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EP2630012A2 true EP2630012A2 (de) | 2013-08-28 |
EP2630012B1 EP2630012B1 (de) | 2017-12-13 |
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Application Number | Title | Priority Date | Filing Date |
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EP11771120.0A Active EP2630012B1 (de) | 2010-10-18 | 2011-10-17 | Fehlersichere parkbremse für kraftfahrzeuge |
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US (1) | US9428159B2 (de) |
EP (1) | EP2630012B1 (de) |
KR (1) | KR101889994B1 (de) |
CN (1) | CN103167976B (de) |
DE (1) | DE102011084534A1 (de) |
WO (1) | WO2012052380A2 (de) |
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2011
- 2011-10-14 DE DE102011084534A patent/DE102011084534A1/de not_active Withdrawn
- 2011-10-17 EP EP11771120.0A patent/EP2630012B1/de active Active
- 2011-10-17 WO PCT/EP2011/068065 patent/WO2012052380A2/de active Application Filing
- 2011-10-17 US US13/880,116 patent/US9428159B2/en active Active
- 2011-10-17 KR KR1020137012770A patent/KR101889994B1/ko active IP Right Grant
- 2011-10-17 CN CN201180050267.6A patent/CN103167976B/zh active Active
Non-Patent Citations (1)
Title |
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See references of WO2012052380A2 * |
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WO2012052380A3 (de) | 2012-08-16 |
KR101889994B1 (ko) | 2018-08-20 |
US20130282249A1 (en) | 2013-10-24 |
CN103167976B (zh) | 2016-04-13 |
WO2012052380A2 (de) | 2012-04-26 |
US9428159B2 (en) | 2016-08-30 |
EP2630012B1 (de) | 2017-12-13 |
CN103167976A (zh) | 2013-06-19 |
DE102011084534A1 (de) | 2012-04-19 |
KR20130133191A (ko) | 2013-12-06 |
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